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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units ofxxp og3k47yd.3 ;q m4 vo*chtt magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction stateh,f* cs2i h w j7jemc7c+9p9qes that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops ofx9*fe2c g ov;b wire in a coil produces what kind of change on the i*b2;exvog fc9 nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a lor59u 4vqku bgkt)d;)o3 yonv6op of wire produces what kind of change on the 5 9)6q tb okvdo 4v3ug)ky;urninduced $emf$, assuming all other factors remain constant?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wirx2ltq.s( 85vxxu3+ nh/e d nmfe produces what kind of change on the inducdnsqn levf2hm (x53 x./xu t8+ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removedu5 ok-s)j2nm vz,rmf8g,-ik dt c7rm/ from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an indp 9s6cwlimbz(aq i7wod+;cnn*lmh5 w3: 3iw7 uced current in a conductor will be that which tend9ml:w7cq5nzi3plwh3 ; ibod(ma6csw+* iw 7 ns to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizonta ol8vwbb8a6dbr9q8z4y5 id3ol table. A bar magnet is held above its center with its north pole pointing 8dbib38r 4ywl9vd aobz65o q8 down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies fla/4d b0 nsotlb5t on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet ins0old45b b t/nduces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where t+d:d i.lx j 7ja3ew3ozhe magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from xjjl3e7i:awz do 3.+dabove, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level tabl06e2jju-k i xle top in a region where the magnetic field vector points straight up. The magnetickl6 ijeu 2j-x0 field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where ind, ft.a 4hp0+f-q dl9hqcx.the magnetic field points straight do,hl afhd.n+0f.c -iqd4xtpq 9wn. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal tttuo+ m4d a *0*gjq;fjable and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed a4jt+*u qmg d jt;0f*ofrom above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north polz2b rb( v 7ey9y/l9 9ml-xnxque entering first. As the north polel2x(qebb m9x9zy 9u7ynr-/vl enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular svtlbes0/i :4alx7 p7d peed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of ro7exv:d/7 ll i0bap4sttation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axisks6 ;mf-5pf ni whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be 6 pi fm5-fsk;nthe orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.fc qr1x(09iva5 u2yhx:javi 3w9fi/e
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways d9 yymv-d4+ githat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic y(a hghr.z5-xw5 itpw;+ef j9d 8zws.field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west dd0v 6f 1epr hw/lalk22irection) is moved northward at constant velocity through a magnekef1a ldvp 26/02wlhr tic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angulv8 cb i)m7)gjnmys2pdr0qc/-ar velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transforza9 ks27xp7 ma1/saiks x;7 lsms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 ife-4a jo3 f:irevolutions each second. The frequency of the j:f fi-a4oei3$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device use*v eko)8lkiu h-*v1 hpd to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a d: zpg*; c0a3i)qgip bbevice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primary coiur)dh oz)h94p+ wszh/9 hwzr/ud ozh4)+ h)psl then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops thh/ e oyn..v+dxan the secondary coil then it i xhdo/y.n.+ev s a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpulr 7dg8g)r n07 6va)9fg; v nez1ytpcjt

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant8u lg;xqb1j x e.li0y) circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ide4f 0mzz u3.x.e +httihal battery of constant terminal voltage. At the moment contact is madeu z. .0i4em x3h+hzftt with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batts98ya(p fav-gne/e 9l ery of constant terminal voltage. Asgee l 9y9vpf(a- a8/nt the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance u)4q2pw) sub-w wcei2R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to d9j9x q xkw68i:mim4u an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time consn*qf 5q xg l ik:0cyop6a47ff8tant for the circuit represents the time required forgfpi06f*oy 4k8 lq5c:7aq xfn the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batj 4*:n;cocc:;pi w en3)qbvi ttery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current4 vn)cbn ioq:ij*ec;;pt w:3c to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exco2rfl/y3q6l6azfqhn- g5 3scept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circubb:dan3 m4wro4vr 9 *fit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, c, ud4.tsdg) z0y.tqrthe current .sqttud,d cy)rg4. 0z

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac c k,nn5y7u+ealircuit changes by what factor when the frequency n ,k5ey7u+ nlais tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubg m94fc/izxu-,bpkam f:9wek+ k+ 2rfled, the inductive reack mgm +4ukz9/bfc e9i-,r2pxf kfw :+atance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an indu+hp, nzbd8lg() ,fnmfctor approaches zero, the inducb h,mlnf (n8d+fz,p)gtive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supplrfx0;s,buj36c*ely q n0,k fry. In this circuit, the curre; b*j3,y0 nq, ksxerf6cul 0frnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by wh+t 1bdxs ii6)may0jov4:m cu/6cf.w qat factor when the frequency is tripled oi+djasf1t 6umi4cw) c. x m06yb:vq/?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approay y +y,svl2tw,ches zero, the capacitive yw,yv2t +yls,reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase ans1nzgcar*o,0:/m x;w iqok w4gle between the voltages of the inductor and capacitor in a RLC seriesxciw 14*ga, zkn/;:r wqm0oso circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC )t(, eycm2 o*b1klfrs circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the cin -7dqi.7a4 6g jeyuq t5b z2-cp/i-jpfb2oygrcuit increases if R increases. i-i.gc-u qaz7efjpt 2jog7 qyd /b -5y6pn24b When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ifsgwumrf+ c-x:.:1svf $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The id5-k jeyeg( o+mpedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in ansl5fbo boy fx 7yn()xy f1ejq9g:8-v5 LRC series circuit, the resonant frequency of that circuit 7e:f1s- og)oyb(nyybx8f9v 5 jql f5xwill

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circui2y; lsag6 c q dx78ce*lzmtj8,t that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs wv 26qst6jdn(d hen

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fyjhqq, 4r*ud 69 ixa59ai0 myfield of 0.20 40yx9u59m6 qaihrj ,iyfq *adT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a 4(/6 +r;l s g7k *d)dffmmc*fzkamecn uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane ocgmc; f*r/dd6 s4lk zek n)f*m(7mfa+f the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a u)u/a-*- yboaiim ncg0niform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at icgbu) in/ mo*aya0--an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of a0;ym21p 1e tlu b9 qxpml.2gsvn adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil c 0 qw.)ym+,lyqgva 7tzhanges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped withlxu 3rgu7.tx(go c,(g yma; w2 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the ind( ;x2g .o7g 3atu ly,u(wrmxcguced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wireo01hjt(jila +e (w3w 0nqm/wi with 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns az u7ut35 zk5mvcy7m:wnd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of mtq7 i vr25k9d0e zvns-ebr+/ 60 m flies horizontally at a location where the downward component of the Earth's magne 7 02-/ ieq9rnksb+5vvm zdtretic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.qzmd4 :nqt igg:*5ufuqw2r :*0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a cmg:r t5f d*z:u qq: 4uwinq2*gonstant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 ltxn;4+c mh/ c/)e a)t;lowufmu tl1zpl50ql/oops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 ta2fz*tk p1 e/gcni c/:urns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 1h50wi.fcoe ,wyb)4 i n2 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetii.e4 iyo5w),hwc nbf0c field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of;k 7hgv ;vrm+3vmzm1x3ul vd7 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outp-y-fv/b m;:n b*tnscud:zon 2 ut of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coyz --c:; 2 /tvnm*sbubndn: foil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator70py7c7ah sz w-3cx ck with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistanc0*lyip zcjz + g0w4s;re of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. djkb,xuy7 --z The motor operates on 120 V AC, and when running at full speed it generates a bacd- , b7-yujkzxk $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V po :th0lwjed99 dwer supply. The operating current is 1.0 A. What is the start-up e d90th9l dw:jcurrent?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V xa-w k:aor d7a 66fj(hi.ke8czr)-wa power supply. The operating curre78c6ri a- ofehwk.j:aarkw d6-zx()ant is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistan,ja hr)+g,jm tce 6.0 W is connected to a 24-V power supply. The operatin,ht,mj r)a+ jgg current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a prim l7j,/dflmrh9 ary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transform0vmkx(q gzz-sm ps,30 er causes 14 A to flow in the secondary. How many turns are in the secz 0mq xmkzsgp,(3s0v-ondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turnsgnohjlc378s z pe vv7e0nn *0(bfzx 5(o;mm x4 are necessary in a 110-V primary if the 24-V secon*z450j3(hv8;ncs0 eb7 op7zmvg(xfn eno mlxdary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil ane5(gw f )60v tlgqy*pj9 zj/tud a 2000-turn secondary coil. j6(qtzy/ujge)pgt 0 fv 9w*5lIf the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primaldxu , x6i,2ctry of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondal,c 6u,txdix 2ry?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a ney6 4-h:mv g)e7k8bw4ksofsmaon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What k4fykmvw:goba8s)7s-4 e6mhdoes the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer ha rze-0kcdhx64s 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pr-c 64zkx h0edresent in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60m /uwfmb e bw0i,7*,vu turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the pri/wbb,vu 0emu w*mfi 7,mary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seconk xebz ghd) m62dry57,dary has 200 turns. If the input curren6k)d57deyxg,hmr2 bz t at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If to3 9j/*ykbldqx xad-.cc)lr/y ny 42the input voltage to the primary is 100 V, we can expect th )t y*42xblkld3/.cy-d9ojn xa yrq/ce output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tuez5xg s 4g545 9rwugalrns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losse 4se g5lzg5 rg49u5axws)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is us0/zdr xbk4 (uyiu7h +vually stepped up to 4500 V by a transformer and transmitted7ux (zdhi /ub0v k4+yr through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Thlam xm09ii*fa qym-,2e voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of t i*9xiy a0-fm,amm l2qotal resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of chlu2d5-zvl)ju (bp7vf:-q g ourrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of to d:7- h vg)j-u(pvlqbz2ofu 5ltal resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km loqvt*n.g j l +busmp727ng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the.s 7bg qu7+nmjpt2v l* transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistances (f pcv0;qw9e of 0.60 W. A generator produces 100 V at 70 A. In( v0;9pfsqw ce order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 Vtb-b56 )sz zb go+qh0f. How much less power would be lost if the power were transmitted at sto+b5hqz g bz0f6 -b)3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It if k j4; qecm2wwp92n6yq(diw8 s to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a tra(k6 ecd jf82nw p iw2ywq9q;4mnsformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.n 84i)p uc6frec(vww30 A. How much energy is stored in the coil's c6p ervw(3nw4ifc) u8magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H i8i+ f8 qg1*cdhfpbb*+w+ zgid nductor. What is this circuit's time c* p88zc+b hidgf1 wqf*d i+g+bonstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms ae9( 0uu lbh)vvoltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is tet3c- gjo0 *olhe peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the 8cm 6y4zzy/lglamplg8myc4 zz /y6?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected tob gpjtoaahw:+o15 :. x a 120-V ac power supply. What is the peak current :x :1pao t+b.o jgahw5through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powep lzkrdq1i 8 vb/bw6ayc32-.fzfw*,y xs. ae1r diss8-rxyb.di/*wz 6wap1sabf el fqkvczy32., 1ipated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through k)n: o3dq(x:t*ba25ax mm hdia 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor wouwhwqz j)g)y3 (2vj+h;r:bis $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resiv ( *e;x4orjwustor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance ydx69*cj 9 dcdof a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 106srk9( v2lt )o;slo 4mf;tjqr00 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil f: n7f6nl6 2thjgy,yq3e bec*t z51kthave 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W oryx;d-14y xn ,t xedy7f inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at n 7jyfs 6g o3rx/m5dv/a frequency of 20 kHz is appliedysj6/ v/rxdm o537ngf to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a r kgwt5s t*kd7):ece( /tuzy4 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kt3 +xf86w9q, (wnsvd k (mdqfhHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor if;950m0psuek wcdt 5ps needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF cx:8n zpmc4auae1y 4l/ apacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will trnku7p i8e(( 9ku,lv-r;m)vk 8p bftqhe capacitive reactance of a 0.010-mF capacitor be 100 Wkrm(v7 9-ke8uir(;nvk utqf) l,p p8b ?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor (*fj *c-amf ihj o )gbfkarz1e;8vs); at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resisa-/5 hioqnd5dhk7 af(9d: uz ytance, 15.0 W inductive reactance, and 10.0 W capacitq5:d( / inu zokaa759hdyd- fhive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-Wv;*m +c :mlkt9vo b1mc resistor, 20-mH coil, and 1.0-mF capacitor are connecteot;* 1m+k:vb 9cvmlmcd in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH c6t.2 k vpoxbs.oil, and 1.0-mF ck.st vo x.2p6bapacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected i7oo 7-4aq8c*f ei cvcjn series with a 20-mH inductor, what is the impe joocvc- 8fq7a7c*i e4dance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with x)8f)wh q*mrrqn0ph8 j4ld 0f a 20-mH inductor, what is the phase angle at 1000 Hz?)8 8)4qmpqn r rf0jfwhxlh *d0

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and tg.qf/47,p6zqixtt4r u;d u c 1.0-mF capacitor for a total impedance of 100 W ttiu4p/fc4xz, .dtqqg67 u;rat 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a:jqv6,t6mrei 1o:hwy mh s8j.j-/twr 100-W resistor and 15-mH coil to get a tot/t:jeqj rots,y 1 h6:wvwrjm6.8h- mial impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a ti9 4a)qqmo wd a apir8910-qzjf8x-f xotalir9fxo z 0f94q8jx1 -a qad- iawp8)mq impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resist t0 j)eou7-fedor at 1.0-MHz for a total impedance of 150 k0-7)ed ftuejo W?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in seriesv1fo f36ea19x .vqgzvbc f r3. with a 20-mF capacitor. What is the impeda e.6vg1f3v o3xazbfc9q v1.rfnce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.04,1 +hes ,; blbmo hsth 7us/ul-qzcr- kHz for a total impedanceh+mlre, q,zub-1 hbhs/u74t s csl -;o of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed h(x 3s77h//fn)fwao(leu )) buwudksin series with a 10-mF capacitor at 1.0 kHz for a phase aul shw wh(n7k/ub/f d3)u) ) xo7fes(angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at pm 8hy7k: de-c1.0 kHz for a total impe kdc8-pe7yhm:dance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What ix,. p akgz9:v1wou l2ts the phase angle?to9z:ul1vp,.a gxk 2w

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 15 jkzf 6d3ltg6/00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co 3/f6t6kzg djlnnected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacito,qdmibwo,nm w ,v9,d)5z g-bo r, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What ,gb ndm mow5w 9z)-,vbo,,iqdis the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reac 84ajia2jf) b-k)wqg wtance 30 W, and an inductor of inductive reactance 30 w8qabjw4aij-2 gk)f )W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circb; 13)rupynxl uit containing a 50-W resistor, a 10-mFn3)b ; ulrp1yx capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in serid.p(+; z:ihv bhzql42,.b l4dkwpuefes with a 500-W resistor for a phase angle of b2.lq.,bkeu4;4w fh (dzlvhzp: ip +d$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W,/hxaa99whf g fjp ishmx,5uw2198 s i1 L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maxisxs825p9 hgjfma1u1wf whi,x 99 h/aimum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power outp-pt)5 qhv1do e rzzl*h,(x5yl ut in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive react5-( dz)l *hztprhyo5xv,q le 1ance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC hh5uu-nw9)ken1ak v b: 96tkw;t3 erj circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 3 l:pig5 s4sg(n0 W. What is the pognsp:4lsi 5 g(wer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series t./;i y*oezm1d/kdgko n.5vl RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, we; l1d* /./dy5i gn koktvmzo.hen connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequencyh5pbdr:e-d750eacs dbp--kr ni :j* y of a 1.0-mF capacitor and a 15-mH coil in series?bh5*-ad5j-r-:s :r e dykppideb07cn

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonanpiqz: ; dt8ksa)8 k c g8rg/,2unyfqz3t frequency ;8 gayk8z,pdg:sn8 k t f2 c3qrq)uz/iof 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH induyxkuu4gi;2pzzv15connn,f): z9tq kp -r 3 *uctor for a resonant frequency of 1000 Hz:n-zkvn4uu*p2po gx zky i;cn1t) 9,ruqz 5f3 ?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W rn+p+pa g* iyd8wd.)ty esistor and a 40-mH coil if the resonan+* .+ gay npi8)ddtwpyt frequency of the circuit is to be 1000 Hz?

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